As a national key water transport engineering during the 13th Five Year Plan period，the first phase of the South Passage navigation channel regulation project in the Yangtze Estuary was completed and put into trial operation in June 2020. Based on the analysis of the field data of the capital dredging project of the South Passage 6 m navigation channel，the expected effect is achieved in the process of implementation，and the five main characteristics are as follows：1）The dredging construction scheme is reasonable and feasible，and the amount of dredging engineering in the capital construction period is consistent with the design expectation. 2）The new navigation channel scale is dredged on schedule，and the grooving effect is different along the waterway. 3）The management and control of the dredging construction process are standardized，and the various construction difficulties including high navigation density in the operation water area are overcome. 4）The dredged material is disposed in compliance with the regulations，and part of the dredged material is used as the bagged sand filling materials of regulation buildings，which make up for the short-term shortage of engineering sand. 5）the 5.5m temporary navigation channel of the South Passage is dredged in time，which ensures the navigation safety of ships during the construction period. Meanwhile，the key points of operation and maintenance management of the South Passage 6 m navigation channel and the assumption of further development of the waterway are expected.